[gst-devel] decodebin vs playbin
rdowdall at cranksoftware.com
Tue Jun 1 04:53:10 CEST 2010
I am trying to play the audio and the video from a mp4 file. If I run
the following line:
gst-launch -vvvvv --gst-debug-level=2 playbin uri=file:///<path_to_mp4_file>
Then it plays the file's audio. I'm not putting the video anywhere, so
I can't see if it is playing or not, but I assume it is based on the
If I do the following line:
gst-launch -vvv --gst-debug-level=2 filesrc location=<path_to_mp4_file>
! decodebin2 name=decoder decoder. ! audioconvert ! audioresample !
osssink decoder. ! ffmpegcolorspace ! xvimagesink
It hangs at:
Setting pipeline to PAUSED ..
caps = audio/x-m4a
Pipeline is PREROLLING ...
<audio debug output snipped>
I need to open this file in C code, and grab access to the buffers. I
was planning on using appsink to do it, but any time I pass in a video
sink to the pipeline, it just hangs, never playing the audio, or moving
forward. As I said, I need access to the video buffer, so either I need
a way to grab it from the pipeline created from gst_parse_launch, or I
was thinking that if I set up the pipeline myself, I could use a handoff
signal on the last video sink, or mayber use the appsink methods.
I have a feeling that I am missing something simple, and was hoping
someone could point that out.
**Crank Software Inc.
*Online*: www.cranksoftware.com <http://www.cranksoftware.com/>
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